Kurt,
I tried that, no dice. If I set it to SSL_ENV it doesn't pick it up, in ASP code, but SSLENV does work. In fact I initially thought the issue was with the _ character because if I set the header to SSL it worked fine, SSL_ENV doesn't work but SSLENV does work. I understand the difference on the prepended HTTP_, but this is something beyond that.
What I mean by string is, in ASPX if I set the server variable as a String variable not varchar or int etc. it displays the entire string HTTP_SSL_ENV, if I simply Dim the variable and reference it, it doesn't display the value. I am not sure if this is an F5 issue or an ASP encoding issue at this point.